I just go with a decent set of pads and disks and keep the wheels clean (like hell I do) but then we mostly do longer drives with less braking so the brakes last longer where we are. I had to change the Volvo pads after 8yr because they rusted the material loose😱
It could be the handbrake. A lot of cars do it. As the sus drops the angle of the arm changes at the rear and can force the handbrake a little.
Your on cable and not electric aren't you @gold rover? 🤔